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#ifndef MAPVIZ_PLUGINS_IMAGE_PLUGIN_H_
#define MAPVIZ_PLUGINS_IMAGE_PLUGIN_H_

// C++ standard libraries
#include <string>
#include <list>

#include <mapviz/mapviz_plugin.h>

// QT libraries
#include <QGLWidget>
#include <QObject>
#include <QWidget>
#include <QColor>

// ROS libraries
#include <ros/ros.h>
#include <tf/transform_datatypes.h>
#include <sensor_msgs/Image.h>
#include <opencv2/highgui.hpp>
#include <cv_bridge/cv_bridge.h>
#include <image_transport/image_transport.h>

#include <mapviz/map_canvas.h>

// QT autogenerated files
#include "ui_image_config.h"

namespace mapviz_plugins
{
  class ImagePlugin : public mapviz::MapvizPlugin
  {
    Q_OBJECT

  public:
    enum Anchor {
      TOP_LEFT,
      TOP_CENTER,
      TOP_RIGHT,
      CENTER_LEFT,
      CENTER,
      CENTER_RIGHT,
      BOTTOM_LEFT,
      BOTTOM_CENTER,
      BOTTOM_RIGHT
    };

    enum Units {PIXELS, PERCENT};

    ImagePlugin();
    virtual ~ImagePlugin();

    bool Initialize(QGLWidget* canvas);
    void Shutdown() {}

    void Draw(double x, double y, double scale);

    void CreateLocalNode();
    virtual void SetNode(const ros::NodeHandle& node);

    void Transform() {}

    void LoadConfig(const YAML::Node& node, const std::string& path);
    void SaveConfig(YAML::Emitter& emitter, const std::string& path);

    QWidget* GetConfigWidget(QWidget* parent);

  protected:
    void PrintError(const std::string& message);
    void PrintInfo(const std::string& message);
    void PrintWarning(const std::string& message);

  public Q_SLOTS:
    void Resubscribe();

  protected Q_SLOTS:
    void SelectTopic();
    void TopicEdited();
    void SetAnchor(QString anchor);
    void SetUnits(QString units);
    void SetOffsetX(int offset);
    void SetOffsetY(int offset);
    void SetWidth(double width);
    void SetHeight(double height);
    void SetSubscription(bool visible);
    void SetTransport(const QString& transport);
    void SetRotation(QString rotation);
    void KeepRatioChanged(bool checked);

  private:
    Ui::image_config ui_;
    QWidget* config_widget_;

    std::string topic_;
    Anchor anchor_;
    Units units_;
    int offset_x_;
    int offset_y_;
    double width_;
    double height_;
    std::string transport_;
    int rotation_;

    bool force_resubscribe_;
    bool has_image_;

    double last_width_;
    double last_height_;
    int last_rotation_;
    double original_aspect_ratio_;

    ros::NodeHandle local_node_;
    image_transport::Subscriber image_sub_;
    bool has_message_;

    sensor_msgs::Image image_;

    cv_bridge::CvImagePtr cv_image_;
    cv::Mat scaled_image_;
    cv::Mat rotated_image_;

    void imageCallback(const sensor_msgs::ImageConstPtr& image);

    void ScaleImage(double width, double height);
    void DrawIplImage(cv::Mat *image);

    std::string AnchorToString(Anchor anchor);
    std::string UnitsToString(Units units);
    std::string RotationToString(int rotation);
  };
}

#endif  // MAPVIZ_PLUGINS_IMAGE_PLUGIN_H_
